Antlia 3nm OIII Pro Series Filter - 31 mm - OIII-PRO-3NM-31 StarField Newtonians Maksutov-Cassegrain telescopes are noted for

Maksutov-Cassegrain telescopes are noted for their higher f/numbers for high contrast

75 adapters to accommodate various DSLR cameras and professional astronomical cameras

2 x USB2 High-Speed Ports

All-metal precision internal construction makes this mount strong and stable

In terms of mechanical design

Antlia 3nm OIII Pro Series Filter - 31 mm - OIII-PRO-3NM-31 StarField Newtonians Maksutov-Cassegrain telescopes are noted forThis very narrowband 3 nm OIII filter from Antlia is part of their Pro series and is of the 31 mm unmounted variety. It is normally used in a 1. 25" 31mm filter wheel, where it drops into place. Antlia 3nm Pro Series Oxygen III Filter 31 mm The Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering